Dr . Mohammed Abdullah Muhammad Shafi Al-Hajri 2020. The Effectiveness of the Numbered Heads Strategy in Mathematics Teaching and Increasing Motivation towards the Subject from the viewpoint of Subject Teachers. Journal of Arts, Literature, Humanities and Social Sciences. 55 (Aug. 2020), 368-387. DOI:https://doi.org/10.33193/JALHSS.55.2020.425.